Cabbxjbjbteb



C. L. RAYFIELD.

CAHBURETER.

APPLICATION FILED APR. 16. 1014.

1,312,749. :e .l'aflcntvd Aug. 12, 19W.

4 SHEER? SHLEY q a,

Char S L. g zgfie/d C, L. RAYFIELDJ CARBURETER.

APPHCATION FELED APR. I6. 1914- 4 SHiEIS SHFU C L- RAYFIELU' CARBUREIER.

APPLICAHON F!LED APR. 16. rum.

I IN l Patented Aug. 12, 11 i).

4 SHEETS SHEET 4.

UNITED STATES PATENT curios.

CHARLES L. BAYFIELD, OF CHICAGO, ILLINOIS, ASBIGNOEJQ, FIN'DZEISEN & KM?! MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS,

NOIS.

Specification 0! Letters intent.

Patented Aug. 12, 1919.

Original application filed April 16,1914, Serial No. 532,158. Divided and this application filed April 18,

1914 Serial Ro. 882,159.

To all w/mr/iit may concern:

Be it known thatI, (ll-[ARLES L. RAYrinLp, a citizen of the United States, and a resident of the city of Chicago, in the county of Cook and State of Illinois, have invented orrtain new and useful Improvements in Carburetors; and I do hereby declarethat the following is a full, clear, and exact description of the same, reference being had to the accompanyingdrawings and to the numerals of reference marked thereon, which form a part of this specification.

'This application is a divisional application of my co-pending application for patent Serial No. 832,158 for Carburetors, executed of even date herewith.

This invention has for its object the provision of means associated with the automatic air inlet valve'of a certain type of carburetor for augmenting the pressure in the sources of fuel supply in the carburetor to assist the flow through the various fuel valves, which introduce fuel to carburet the air for combustion purposes.

It is an object of this invention to construct a carhureter having an automatic air inlet valve and dash pot associated therewith communicating with the fuel supply, and with an inlet fuel supply valve communicating in said dash potand adapted to ment of the automatic air inlet valve serves to open said fuel supply valve, and with pressure augmenting means connected to said air valve to force fu'cl under pressure through said fuel valvp.

It is also an object of this invention to construct in combination with a carburetor, pressure augmenting means associated with the automatic air inlet and with an auxil iary fuel supply valve mounted adjacent thereto and opened thereby, whereby an opening movemento said air valve increases the pressure in the various fuel supcommunication between said respective fuel supply chambers to equalize t e pressure therein.

It is furthermore an object of this invention to construct a carburetor wherein a plurality of fuel supply valves are provided, each communicating in a different fuel supply chamber, said supply chambers communicating with one another and with means for augmenting the pressure-in said fuel supply chambers to force fuel through the respective fuel-supply valves.

It is finally an object of this invention to construct a carburetor instantly responsive to a sudden opening movement of the throttle valve to cause a chargeof fuel tobe introduced into the carburetor affordinga rich mixture adaptedlto accelerate the engine. A

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

In the drawings:

Figure 1 is a front side elevationof a carburetor embodying the principles of my invention.

Fig. '2 is a rear side elevation thereof.

Fig. 3 is a central vertical longitudinal section taken through the carburetor, with parts shown in elevation.

Fig. 4 is a fragmentary enlar d detail section taken through the air in ct end of the carburetor.

Fig. 5 is an enlarged detail section of the air-controlled fuel supply valve.

Fig. 6 is a section on line 66 of Fig. 5. Fig. 7 is a fragmentarytop plan view of a portion of theoperating mechanisms of the carbureter.

As shown in the drawings: The carburetor com rises an integral casmg afl'ordlng a float cod chamber 1, and a m xing chamber 2. The casing 1, of the float feed chamber comprises cylindrical side walls and an integral bottom wall 3. having. a central or axial downwardly directed tubular boss 4, integral with the bottom there,- of and opening upwardly thereinto. Said boss is closed at its lower end by means of a screw plug 5, threaded thercinto and en.- gaging a suitable packing washer 6, between. the same and the end of said boss to seal the connection. The cover 7, for the float feed chamber is reinovably secured thereto and extending axially through said chamber and a suitable central aperture in said cover 7, is a rod 8, of a length to extend into the bore in said boss 4, as shown in F1 3, and to normally extend slightly above t e cover through an aperture therem. A'd ustably but rigidly secured on said rod is a float 9,

I .in the present instance shown as constructed 1 M of sheet metal) and having a sleeve 10, extending centrally therethrough, and through which the rod 8, extends. Said float feed chamber is cored from the side Tadj acent the mixing chamber to afford an inward extension A, of the chamber in the space between the same and said mixing chamber, and, as shown, the casing of the mixin chamber 2, is constructed to afford a silnL ar chamber B, extending over said chamber A, and through the wall of the float. feed chamber. The bottom ofsaid cham-ber A, of the float feed chamber, is rovided with an aperture therethrough, and threaded therein at 1ts upper end is a c lindnc fplug 11, which serves to close thegottbm 0 that portionof the float feed chamber and is provided with a central upwardly open recess or bore therein, communicating with a restricted central boreextendin therethrou h, which affords the seat for t e inlet neec 1e valve, through which the flow of the hyiro-carbon' 'fuel into the float feed cham is controlled; Said plug is provided on its lower end with a peripheral downwardly extend ing internally threaded flange 12, and threaded thereintois a hollow connection 13, having a screen 14, stretched across the top thereof.

The induction pipe 15, whereby the gasolene tank communicates with the float feed chamber, is threaded into said connection 13. The horizontal rtition 16, between the extension B, of t e mixin chamber and the extension A, of the float ecd chamber, forming the bottom of one and the top of the other, is provided with an aperturethercthrough and threaded therein in alinement with the corresponding seat in the plug 11', is the tubular nozzle or jet. pipe 17, theuppcr end of which extends above the floor 16, in said extension of the mixing chamber, and the lower end of which extends below said partition 16. Slidably and loosely engaged thereon in the'extension A, of the float feed chamber is a sleeve 18, which, near its lower" end, is restricted and tapered tea point to afford the valve closure 19, to seat within and to close the induction passage through the plug 11;, ,Said, sleeve 18, is provided with apertures 18, therein slightly above the extension B,

bottom ofthe float feed chamber to admit the fluid from said float chamber thereinto,

and a peripheral flange 20, is provided on said sleeve intermediate its end as shown in Fig. 3. A weak spring 21, is engaged around said sleeve and bears at its upper end on the wall 16, and at its lower end on said flan c to hold the lower needle valve normally 0 oscd when the float feed chamber is suflicicntly full to support the float. Removably secured in the float feed chamber on the bottom thereof is a bracket 22, and pivotally enga ed thereon is a lever 23, the shorter end 0 which is yoked to engage around the sleeve below the flange 20, and the longer end of which is provided with an aperture therethrough toreceive the rod 8. As shown, a diametrically apertured ball 24, is rigidly secured on said rod 8, and seats on said longer end of the lever 23, to afford a self-adjusting bearing for the float on said lever. Said plug 11, is provided with a passage 25, extending downwardly from,,its innor end to a passage 26, extending peripherally around the same. A pipe 27', is at one of its ends threaded into said plug 11, and communicates with said passage 26, and at its other end is threaded into the lower end or ezgtcnsion forminga dash pct, 28, of an air inlet valve casin 29, which is threaded, on a, horizontally directed portion of the inlet to the mixing chamber 2.

Integral with the rear wall of the mixing chamber or in otllqr words directed toward the float feed chamber is a bracket or arm 30, having a cylindric seatv in the underside thereof co-axial with the bore of the jet nozzle 17, and engaged therein at its upper end and extending through the to wall 31 of the extension B, of the mixing chamber is a needle valve closure 32, for said jet nozzle 17. A spring 33, engaged in said seat in the arm 30, bears on the upper end of said needle valve to hold the slime normally seated.

Journaled in a 'table bearing on the rear wall of the mixing chamber is a transverse I shaft 34, and secured thereon and projecting into a sl, t in the stem of the needle valve closure 82, is a finger 35, which acts with a rotation of said shaft 34, to raise said needle valve closure a ainst the tension of said sprin 33. At t alfor ing the mixing chamber is provided an outwardly extending flange 36,- which may be a ertured to afford engagement with the manifold pipe leading to the engine. Extendngg throu h said mixing chamber is a shaft I 7, para lel to shaft 34, above the of the mixing chamber, and rigidly but adjustablysecured thereon is a butterfl valve closure 38. The butterfly valve 0 osureBB, may be slightly cut away on one side thereof in a well known manner, though not so, shown, to afford a suflicient passage for the mixture to ,themanifold ipe e upper end of the casing to support Combustion when the throttle is substantially closed or at its lowest running adjustment. Secured on the outer end of the shaft 37, is a throttle lever 3, whereby said shaft may be rotated and said butterfly valve adjusted. Also rigidly secured thereon is a rectan ulur block 40, at the inner side of the thrott e lever and slidably and adjustably secured thereon is a cum {1, comprisin cum faces arranged approxmnitely at ri tangles to eaclrother and the corner whic would otherwise be formed thereby is cut away to afford a rounded continuation of the cam, as clearly shown in Fig. 1.

A screw shaft 42, journaled in theends of,

said cam block, is threaded through said block and extendin through notch in the shaft 37, is provi ed on its outer end with an adjusting head 43, whereby the cam may be shifted on said block 40, with reference to its center of rotation, to-wit the shaft 37.

I 34, to operate said needle valve.

til

whnected thereto at the extremity thereof Loosely engaged on the shaft 3l,for adjusting the needle valve closure 32, is a downwardly and forwardly extending arm 4-4, provided at it's forward end with a hearing plate 45, removably secured thereon and contacting beneath said movable cam member 41, and adapted to be thrust downwardly thereby to actuate said lever and the shaft Integral with the arm 44, is a dow-nw'aydly extending arm 46, provided with a set screw 47, extending therethrough and rearwardly beyond the some. a i

lti gidly Secured on Said slut-ft ,3 by means of a bracket arm 48, is'a tubular ele'ment 49.

Jonrnaled in'said element is a shaft 49" haw ing rigidly secured on the lower end thereof a cam or eccentric 50, which bears against therearwardly extended end of the set screw 47, to actuate the haft 3-l, when the shaft within said tubular element is rotated. Slight movement ofthe arm- 46, on the shaft 34, is afforded, so that rotation of the cam 50, against the ad'usting screw serves to swing the lower en of the sleeve or tubularelement 49, forwardly, thereby elevating the finger 35 secured on said shaft on the into rionof the carburetor and slightly .opening the needle valve closure admitting to the extension B--'of the mixinichamber a so 1111 offuol. secured u on t 'e' upper end of shaft containedwit in theftu ular element is a lever 51', and an actuating rod 52, is

by minus of a set screw 53,"and said actuatin rod 52, extends slidably through a bracket 54 mounted on the cover of the floatfeed chem er. i

, Rigidly secured on the end of the shaft 37, at the opposite-side of the carburetor is an arm' 55, provided with'a set screw 56, adapted to engageori a. projection or lug 57, on the outer wall of the mixing chamber, as

the.

clearly shown in Fig. 2. As shown, 'a set screw 58, is employed for engaging said arm 55, on the shaft. Said set screws 56 and 58, afi'ord means for adjusting said arm to limit the degree of closure of the butterfly valve to the required amount to maintain a sullicient supply of mixture to the motor to maintain the combustion at the lowest speed of the motor.

. conduct the air in a strong inflowing current or jet against the jet of hydro-carbon as it comes from the needle valve, thusspraying and thoroughly vaporizing the same and carrying the some therewith into the mixing chamber :2, beneath the butterfly valve 38. As shown also in Fig. 3, a slight elevatioh or rib (30, is provided on the floor ofthe extension lg'of the mixing chamber at the point where the same communicates in the main mixing cl'iambcr, thereby serving to maintain a thin film or layer of the hydrocarbon fuel on said floor 16, to expose a large surface to vaporization.

Another inlet fuel valve or nozzle is providcd within the air inlet casing 29, and this comprises a tubularmember 61, which is threaded into the top wall of the dash pot chamber 28, and extends downwardly therethr'ongh communicating therein at its lower end through an apertured plug (-52.

A perforated cap 63. is secured around the upper end of said tubular member 61, and slidably mounted therein and through the upper end of a tapered aperture in said tubular member is a tapered valve member 11b (34. Said tapered valve closure 64, is held normally in closed position by means of a. coiled spiral spring 65, seated on the plug 62, 111 the lower end of said tubular member, and

spider 66, integral with an upwardly extendat its upper end said spring bears against, 115

ing rod 67, which is rigidly engaged 'in the lower end of said valve closure 64.

An air inlet port is provided to deliver inflowing air to and across the top of the jet fording an inner seat against which a cdni- "cal disk air inlet valve closure 69, is adapted to rest. an elongated tubular boss 70, is formed axially within said casing 29, and wound therearound and seating at its lower end on said boss is a spiral compression spring 71, which at its u per end seats within a recessed portion 0 said valve closure 69, to normally hold the same in closed position. A valve stem 72, is rigidly secured in said closure (if), and is s idably mounted within said tubular boss 7 with the lower end of said stem extending into the dash pot chamber 28, and secured on said lower end is a piston 73, adapted to move within said dash pot chamber and apertured to receive the tubular element (31,therethrough;

A contact screw 74, isthreaded through one side of said valve closure 69, and is adapted to contact the upper end of said closure (34, to depress the same with a downward or opening movement of said closure (39, and inasmuch as said contact screw is threaded into the aperture 69, it may be adjusted to contact the closure 64, at any predetermined time.

As shown, the outer periphery of said flared'casing 68, isfluted, and a spring detent 75, is mounted in an extension 76, formed on said casing 29, to hold said flared adjustable casing 68, in an adjusted position. Of course, when the casing is adjusted inwardly the compression of the spring against the closure 69, is increased thereby, while outward adjustment decreases such. pressure, thereby allowing the air iiilet valve to open at any desired predetermined draft or difference of pressures.

As shown, a tubular casing or hood 77, closed at its u per end is threaded upon a central raised boss 78, on the cover of the float feed chamber to excludedust and dirt therefrom. iSaid boss, as shown, is also pro vided with a vent passage 79, therethrough from the float feed chamber to vent said chamber against internal ressure. Pivotally engaged in said hoc and extending through a slot in the side wall thereof is a bent lever, one arm 80, of which extends over and into position to engage the rod 8, when the float feed chamber is filled tomormal capacity. The other arm 81, of said lever extends downwardly on the outer side of said hood and 'is engaged by a. suitable rod to permit manual actuation thereof holding the rod 8, with the float thereon downwardly until the carburetor is slightly flooded to facilitate ar'ting carburation. A spring, 82, is engage "on said lever and acts to' hold the arm 8Q, upwardly out of position out of contact with said rod 8, as clearly shown in Fig. 3. As clearly shownin Fig.

3, the carburetor casing is cored around the mixing chamber to afford an exterior water jacket denoted as a whole-by the reference numeral 83, which may be connected to the radiator of the engine if desired. However, web a water jacket may or may not be mvided, depending in part on the size 0 the carburetor, the capacity required and the character or use for which intended.

. ing of the valve may be secured The operation is as follows:

The ca rburcter having been assembled and suitably connected with the manifold pipes of the engine, and with the fluid supply pipe from the tank, is adjusted to regulate the air-supply through the automaticvalve 69, and to re late the inlet to the needle valve 35, in t e extension B of the mixing chamber. The adjustment for said needle valve is eflected by shifting the cam 41, relatively to the shaft 37 b means of the screw shaft 42, to vary the of o ening to the throttle requirement, so that lilac needle valve will be sufliciently opened to maintain combustion at the lowest engine rate when the butterfly valves in the mixin chambers are approximately closed. A wi e range of adjustment is afforded by means of said cam, and practically any inlet requirement can be secured thereby, and when adjusted for the lowest engine rate a further degree of openby means of the cam or eccentric 50, which serves to rotate the shaft 34, slightly in the arm 48, against which said cam acts, thereby permittin the "needle valve to be further opened an slightly flooding the carburetor to begin the carburation. his is also facilitated by means of the tickler leveron the float feed chamber whereb the float may be held depressed and the inlbt valve 19, held open to permit flooding of the float feed chamber. The automatic air inlet valve of course is adjusted so that normally said valve remains closed. By adjusting the flaring casing for said automatic valve inwardly or outwardly substantially any air inlet requirement for certain difierences of pressure ma be attamed. The adjustment of the nee le valve closure 32, within the extension B, of the mixing chamber is such as to maintain a low engine rate of speed, as when the on no ls idling, the mixture escaping therefgbm fromthe manifold i to the cut away pol tron 1n the edge 0 t e butterfly valve closure 38, which is just above the month of the extension D, of the mixin chamber, when said butterfly valve is (:10 As the throtnected thereon and augmentation of pressure takes place throughout the fuel su ply lines of the carburetor, causing the el to be forced under pressure through each of the fuel inlet valves so that the engine may be 'ton movab accelerated in instant response to a sudden opening of the throttle valve.

I am aware that various details t construction may be varicdthrough a wide range without departing from the principles of this invention. I. therefore do not purpose limiting the patent granted otherwise than necessitated by the prior art.

1 claim as'xny invention: i

1. A carburetor comprising a casing affording a float feed chan'iber, a mixing c 1amber, jet nozzles therefor adapted to admit hydro-carbon fluid, a throttle valve, 'means for regulating the inlet from one of the nozzles simultaneously and correspondingly with the adjustment of the throttle valve, ports for admitting air into the mixing cha mber across the discharge for the nozzles, an automatically operated normally closed valve, a dash pot connected therewith, said dash wt in communica on with the float feed cmnber to maintain a supply of fuel in the dash pot, one of said fuel nozzles communicatin in said dash pot chamber, a pis- %e in said chamber and connected to said air valve to augment the pressure in the fuel supply of the tiarbureter to force fuel under pressure through said respective jet nozzles, and. an uninterrupted closed passage for the mixture flowing from said automatically operated normally closed valve to the throttle valve.

2. In a carburetor of the class described a single butterfly valve controllin the flow of mixture therefrom, an air inlet port at one side of the carburetor, an automatic air inlet valve controlling the admission of air therethrough, a fuel valve mounted adjacent said air valve and adapted to be opened directly different proportionate amounts thereby, a closed passage affording an uninterrupted flow for the mixture formed in said air inlet passage and flowing toward said throttle valve, and a piston connected to said air valve and movable in the source of fuel supply to augment the pressure to force fuel through the supply valve into the carburetor.

3. In a device of the class described a casing, a cylindrical mixing chamber forming a part thereof, said mixing chamber open at its upper end and closed at its lower end, a

butterll y throttle valve mounted in said mixing chamber to control the flow therefrom, an air inlet passage communicating laterally inthe lower end of said mixing chamber, an automatic air inlet valve mounted in said passage, a fuel supply valve mounted in said passage adapted to be opened b said air valve, and another fuel supply va ve mountml in a normally open air passage and comnumicating with said mining chamber to supply a mixture thereto when said automatic air valve is closed. '1 i 4. In a device of the class described an air inlet valve mounted in the inlet passage of a carburetor, a dash pot formed on the lower end of said inlet passage, 9, piston mounted on said air valve and movable in said dash pot, a fuel supply valve communicating in said dash pot chamber adapted diseharge fuel into said air passage, sail valve adapted to be opened by said air inlet valve, a mixing chamber in the carburetor with which said air passage communicates, said mixing chamber open at its upper end and closed at its lower end whereby the only air entering the lower end of said. carburetor passes by said automatic air inlet 5. In a carburetor of the class Jescribed a mixing chamber open at its upper end and closed at its lower end, an air inlet passage communicating in the lower end thereof, an automatic air. inlet valve controlling the admission to said passage, a fuel supply valve mounted in said passage adapted to be opened by said air inlet valve, and a dash pot mechanism connected with said air valve to prevent fluttering thereof.

6. In a device of the class described a carburetor having a mixing chamber open at its upper end and closed at its lower end, an air inlet passage communicating laterally in the lower end thereof, a fuel supply valve mounted in said passage, and an automatic air inlet valve offset therefrom and disposed therea-bove to control the flow of air through said air inlet passage and to open said fuel valve different proportionate amounts in ac .cordance with the adjustment of said air valve into open position. 7 In testimony whereof I have hereunto subscribed my name 1n the presence of two'subscribing witnesses.

CHARLES RAYFIELD;

Witnesses:

CHARLES W. Hnus, Jr., FRANK K. Henson. 

